Bell, Sir C., on emotional muscles in man; snarling muscles; on the
hand.
Bell, T., on the numerical proportion of the sexes in moles; on the
newts; on the croaking of the frog; on the difference in the coloration
of the sexes in Zootoca vivipara; on moles fighting.
Bell-bird, sexual difference in the colour of the.
Bell-birds, colours of.
Belt, Mr., on the nakedness of tropical mankind; on a spider-monkey and
eagle; habits of ants; Lampridae distasteful to mammals; mimicry of
Leptalides; colours of Nicaraguan frogs; display of humming-birds; on
the toucans; protective colouring of skunk.
Benevolence, manifested by birds.
Bennett, A.W., attachment of mated birds; on the habits of Dromaeus
irroratus.
Bennett, Dr., on birds of paradise.
Berbers, fertility of crosses with other races.
Bernicla antarctica, colours of.
Bernicle gander pairing with a Canada goose.
Bert, M., crustaceans distinguish colours.
Bettoni, E., on local differences in the nests of Italian birds.
Beyle, M., see Bombet.
Bhoteas, colour of the beard in.
Bhringa, disc-formed tail-feathers of.
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